Cycling rain gear bears a strong resemblance to light ski/snowboard gear, which might be easier to find. It works for me. I do have a jacket with a double zipper pull so you can pull it up from the bottom and free up your hips while your torso is protected.

I have an early-90s vintage rain jacket with a removable fleece liner that my Dad bought me from REI. It's old but perfectly ok for any purpose. The only reason not to wear it much is that the muted teal color is so pre-grunge-era!